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JPET#119412 1 TRPV1 Agonists Cause Endoplasmic Reticulum

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JPET#119412 1 TRPV1 Agonists Cause Endoplasmic Reticulum JPET Fast Forward. Published on March 1, 2007 as DOI: 10.1124/jpet.107.119412 JPET ThisFast article Forward. has not been Published copyedited onand formatted.March 1, The 2007 final versionas DOI:10.1124/jpet.107.119412 may differ from this version. JPET#119412 TRPV1 Agonists Cause Endoplasmic Reticulum Stress and Cell Death in Human Lung Cells Karen C. Thomas, Ashwini S. Sabnis, Mark E. Johansen, Diane L. Lanza, Philip J. Moos, Garold Downloaded from S. Yost, and Christopher A. Reilly jpet.aspetjournals.org (K.C.T., A.S.S., M.E.J., D.L.L, P.J.M., G.S.Y., and C.A.R.) Department of Pharmacology and Toxicology, University of Utah, 112 Skaggs Hall, Salt Lake City, UT 84112. at ASPET Journals on September 25, 2021 1 Copyright 2007 by the American Society for Pharmacology and Experimental Therapeutics. JPET Fast Forward. Published on March 1, 2007 as DOI: 10.1124/jpet.107.119412 This article has not been copyedited and formatted. The final version may differ from this version. JPET#119412 Running title: TRPV1 Agonists, ER Stress, and Cell Death Corresponding Author: Dr. Christopher A. Reilly, Ph.D. University of Utah Department of Pharmacology and Toxicology 30 S. 2000 E., Room 201 Skaggs Hall Downloaded from Salt Lake City, UT 84112 Phone: (801) 581-5236 jpet.aspetjournals.org FAX: (801) 585-3945 Email: [email protected] at ASPET Journals on September 25, 2021 Number of text pages: 32 Number of tables: 2 Figures: 6 References: 40 Number of words in Abstract: 250 Number of words in Introduction: 733 Number of words in Discussion: 1473 Non Standard Abbreviations: GADD153, growth arrest- and DNA damage-inducible transcript 3 (a.k.a. DDIT3 and CHOP); GADD45α, growth arrest and DNA-damage-inducible, alpha (a.k.a. DDIT1); GRP78/BiP, 2 JPET Fast Forward. Published on March 1, 2007 as DOI: 10.1124/jpet.107.119412 This article has not been copyedited and formatted. The final version may differ from this version. JPET#119412 glucose regulated protein, 70kDa (a.k.a. HSPA5); ATF3, activating transcription factor 3; ATF4, activating transcription factor 4; ATF6, activating transcription factor 6; CCND1, cyclin D1; CCNG2, cyclin G2, EIF2α, eukaryotic translation initiation factor 2, subunit 1 (alpha, 35kDa); EIF2α-P, phosphorylated eukaryotic translation initiation factor 2, subunit 1; Bcl-2, B-cell lymphoma protein 2; Akt/PKB, protein kinase B; NF-kB, nuclear factor of kappa light polypeptide gene enhancer in B cells; RT-PCR, reverse transcription-polymerase chain reaction; Downloaded from TRPV1, transient receptor protein vanilloid 1 (a.k.a. VR1 or the Capsaicin Receptor); LC50, concentration at which 50% loss in viability (lethality) is observed. jpet.aspetjournals.org Recommended Section Assignment: Toxicology at ASPET Journals on September 25, 2021 3 JPET Fast Forward. Published on March 1, 2007 as DOI: 10.1124/jpet.107.119412 This article has not been copyedited and formatted. The final version may differ from this version. JPET#119412 Abstract: TRPV1 is a calcium-selective ion channel expressed in human lung cells. We show that activation of the intracellular sub-population of TRPV1 causes endoplasmic reticulum (ER) stress and cell death in human bronchial epithelial and alveolar cells. TRPV1 agonist (nonivamide) treatment caused calcium release from the ER and altered the transcription of GADD153, GADD45α, GRP78/BiP, ATF3, CCND1, and CCNG2 in a manner comparable to prototypical ER stress-inducing agents. The TRPV1 antagonist LJO-328 inhibited mRNA Downloaded from responses and cytotoxicity. EGTA and ruthenium red inhibited cell surface TRPV1 activity, but did not prevent ER stress gene responses or cytotoxicity. Cytotoxicity paralleled EIF2α jpet.aspetjournals.org phosphorylation and the induction of GADD153 mRNA and protein. Transient over-expression of GADD153 caused cell death independent of agonist treatment, and cells selected for stable over-expression of a GADD153 dominant negative mutant exhibited reduced sensitivity. at ASPET Journals on September 25, 2021 Salubrinal, an inhibitor of ER stress-induced cytotoxicity via the EIF2αK3/EIF2α pathway, or stable over-expression of the EIF2α-S52A dominant negative mutant also inhibited cell death. Treatment of the TRPV1-null HEK293 cell line with TRPV1 agonists did not initiate ER stress responses. Similarly, n-benzylnonanamide, an inactive analogue of nonivamide, failed to cause ER calcium release, an increase in GADD153 expression, and cytotoxicity. We conclude that activation of ER-bound TRPV1 and stimulation of GADD153 expression via the EIF2αK3/EIF2α pathway represents a common mechanism for cytotoxicity by cell-permeable TRPV1 agonists. These findings are significant within the context of lung inflammatory diseases where elevated concentrations of endogenous TRPV1 agonists are likely produced in sufficient quantities to cause TRPV1 activation and lung cell death. 4 JPET Fast Forward. Published on March 1, 2007 as DOI: 10.1124/jpet.107.119412 This article has not been copyedited and formatted. The final version may differ from this version. JPET#119412 Introduction: Lung cell damage causes acute respiratory distress and contributes to the pathogenesis of chronic lung diseases (Knight and Holgate, 2003). Evidence suggests that the transient receptor potential vanilloid type-1 receptor (TRPV1, capsaicin receptor, VR1; Hs. 268202) may be a mediator of lung pathologies caused by xenobiotic toxicants and endogenous agonists as well as a therapeutic target for treating and/or preventing lung disorders (Jia et al., 2005; Szallasi et al., 2006). Downloaded from TRPV1 is widely expressed in the respiratory tract including nasal mucosal cells (Seki et al., 2006), C-fiber neurons and airway smooth muscle cells (Mitchell et al., 2005; Watanabe et jpet.aspetjournals.org al., 2005), and alveolar and bronchial epithelial cells (Veronesi et al., 1999; Reilly et al., 2003; Agopyan et al., 2004). TRPV1 is selectively activated by capsaicin, the primary pain producing chemical in hot peppers, and a variety of exogenous and endogenous respiratory toxicants at ASPET Journals on September 25, 2021 including anandamide (Van Der Stelt and Di Marzo, 2004), products of arachidonic acid metabolism by lipoxygenases (Hwang et al., 2000), H2S (Trevisani et al., 2005), ethanol (Trevisani et al., 2004), acids (Tominaga et al., 1998; Ricciardolo et al., 2004), and particulate pollutants (Veronesi et al., 1999; Agopyan et al., 2004). Capsaicin and other TRPV1 agonists are routinely used to study the TRPV1 pharmacology and have proven instrumental in defining the physiological roles of TRPV1 in the lung and other organs. Here we use capsaicin to elucidate toxicological phenomena associated with TRPV1 activation in lung cells. Capsaicin is used clinically to induce cough (Morice et al., 2001) and to treat rhinitis (van Rijswijk and Gerth van Wijk, 2006). However, numerous case reports have described adverse respiratory effects and death in humans following exposures to concentrated capsaicinoid aerosols (Heck, 1995; Steffee et al., 1995; Billmire et al., 1996). In animal models, high doses of 5 JPET Fast Forward. Published on March 1, 2007 as DOI: 10.1124/jpet.107.119412 This article has not been copyedited and formatted. The final version may differ from this version. JPET#119412 capsaicin cause acute respiratory and cardiovascular failure, independent of the route of administration (Glinsukon et al., 1980). Inhalation of capsaicinoids by rats causes lung inflammation and widespread damage to tracheal, bronchial and alveolar cells (Reilly et al., 2003). In vitro studies with human bronchial epithelial cells have demonstrated two principal outcomes associated with TRPV1 activation: pro-inflammatory cytokine (IL-6 and IL-8) production and oncotic cell death (Reilly et al., 2003; Reilly et al., 2005). Cytokine synthesis and cell death were inhibited by TRPV1 antagonists that prevented calcium release from the Downloaded from endoplasmic reticulum (ER) and included LJO-328, SC0030, 5-iodo-RTX. Conversely, inhibition of the cell surface population of TRPV1 using EGTA, ruthenium red and calcium-free jpet.aspetjournals.org media only prevented cytokine responses. In mammalian cells, depletion of ER calcium initiates a homeostatic stress response program termed ER stress. ER stress is generally initiated by a reduction in protein processing at ASPET Journals on September 25, 2021 efficiency in the ER and its roles in human diseases and xenobiotic toxicities have been reviewed (Cribb et al., 2005; Schroder and Kaufman, 2005; Zhang and Kaufman, 2006). ER stress is predominantly regulated by three sensors: Activating transcription factor 6 (ATF6; Hs. 492740), eukaryotic initiation factor 2α kinase-3 (EIF2αK3 or PERK; Hs. 591589), and ER to nucleus signaling 1 and 2 (ERN1 and 2, a.k.a. IRE1α and β; Hs. 133982 and Hs. 592041) (Schroder and Kaufman, 2005). Activation of one or more of these proximal sensors is dependent upon the type of cellular stress. For example, the prototypical ER stress-inducing agent thapsigargin preferentially activates the “translational branch” involving EIF2αK3. Activated EIF2αK3 catalyzes the phosphorylation of cytosolic EIF2α (Hs. 151777) (Lu et al., 2004; Boyce et al., 2005). Heterodimerization of EIF2α-P with EIF2β promotes ATF4 translation (Hs. 496487) and inhibits the translation of “non-essential” genes (Wek et al., 2006). ATF4 translocates to the 6 JPET Fast Forward. Published on March 1, 2007 as DOI: 10.1124/jpet.107.119412 This article has not been copyedited and formatted.
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